Re: [PATCH 1/1] unify DMA_..BIT_MASK definitions: v3.1

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To: Robert P. J. Day <rpjday@...>

Cc: Andrew Morton <akpm@...>, Jeremy Fitzhardinge <jeremy@...>, <bbpetkov@...>, <linux-kernel@...>, <muli@...>, <satyam@...>, <amitkale@...>, <achim_leubner@...>

Subject: Re: [PATCH 1/1] unify DMA_..BIT_MASK definitions: v3.1

Date: Friday, October 5, 2007 - 5:24 pm

"Robert P. J. Day" <rpjday@mindspring.com> writes:

quoted text> On Fri, 5 Oct 2007, Andrew Morton wrote:
>
>> -#define DMA_BIT_MASK(n)	((1ULL<<(n))-1)
>> +#define DMA_BIT_MASK(n)	(((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
>
> or you could take advantage of the macros in kernel.h and write that
> as:
>
> +#define DMA_BIT_MASK(n)      (((n) == 64) ? ULLONG_MAX : ((1ULL<<(n))-1))

#define DMA_BIT_MASK(n)         ((u64)-1 >> (64 - (n)))

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@suse.de
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Messages in current thread:

[PATCH 1/1] unify DMA_..BIT_MASK definitions: v3.1, Borislav Petkov, (Tue Sep 18, 3:46 pm)

Re: [PATCH 1/1] unify DMA_..BIT_MASK definitions: v3.1, Andrew Morton, (Fri Oct 5, 3:47 pm)

Re: [PATCH 1/1] unify DMA_..BIT_MASK definitions: v3.1, Jeremy Fitzhardinge, (Fri Oct 5, 4:43 pm)

Re: [PATCH 1/1] unify DMA_..BIT_MASK definitions: v3.1, Andrew Morton, (Fri Oct 5, 5:00 pm)

Re: [PATCH 1/1] unify DMA_..BIT_MASK definitions: v3.1, Borislav Petkov, (Sat Oct 6, 4:37 am)

Re: [PATCH 1/1] unify DMA_..BIT_MASK definitions: v3.1, Robert P. J. Day, (Fri Oct 5, 5:03 pm)

Re: [PATCH 1/1] unify DMA_..BIT_MASK definitions: v3.1, Andreas Schwab, (Fri Oct 5, 5:24 pm)

Re: [PATCH 1/1] unify DMA_..BIT_MASK definitions: v3.1, Jeremy Fitzhardinge, (Fri Oct 5, 5:28 pm)

Re: [PATCH 1/1] unify DMA_..BIT_MASK definitions: v3.1, Andrew Morton, (Fri Oct 5, 6:24 pm)

Re: [PATCH 1/1] unify DMA_..BIT_MASK definitions: v3.1, Jeremy Fitzhardinge, (Fri Oct 5, 6:32 pm)

Re: [PATCH 1/1] unify DMA_..BIT_MASK definitions: v3.1, Jeremy Fitzhardinge, (Fri Oct 5, 5:23 pm)

Re: [PATCH 1/1] unify DMA_..BIT_MASK definitions: v3.1, Borislav Petkov, (Sat Oct 6, 3:54 am)

Re: [PATCH 1/1] unify DMA_..BIT_MASK definitions: v3.1, Satyam Sharma, (Wed Sep 19, 11:03 am)


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Re: [PATCH 1/1] unify DMA_..BIT_MASK definitions: v3.1

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